Specifically designed for 44mm standards, this bicycles bottom bracket tool and other mainstream bottom bracket models, suitable for mountain bikes and road bikes with integrated/threaded bottom brackets. Make of high hardness steel with black oxidation anti rusts , machined for precise internal teeth that fit bottom bracket interfaces securely, slippage and tooth damage for extended lifespans. Features knurled outer wall for enhanced grip, compatibility with ratchets or wrenches to ensures even force distribution during installation/removal, protecting the bottom bracket and frame interfaces. With standardized socket tool interfaces and internal alignment structure to maintain coaxiality during operations, safeguarding bottom bracket threads. Package includes: 1pc Bicycles bottom bracket sleeve